Squats
405 x 5
455 x 3
505 x 1

This was damn near miraculous. While squatting 405 I felt my mid back seize up. Not nearly as painful as a low back tweak because this was purely muscular, not disc related, thankfully. Cautiously proceeded up to 455, which felt fine, and then 505, which felt very light on my back but was still enough to rekindle the upper thigh injury I experienced last weekend. Was able to walk upstairs fine and the pain isn't bad. 

Boxing yesterday:

3 rounds jumping rope, 3 min each
3 rounds weighted shadowboxing, 3 min each
Partner combos: take turns slipping 1-2s and then 1-2-3s. 2 rounds each for 2 minutes.
Conditioning: plate crawls with push-ups
2 minute plank